Hi EXT users

I've made a simple TAB layout, but when I load a grid into one of my tabs, close it and reopen it again. the grid is not loading. Why?

Link to exampel: http://www.multipumpen.mine.nu/mp/er...ut-browser.php

Click at "Vare" in the left side, close the tab and now try to reopen!!

It is working with other types of content!!